Jimmy B. - How To Change the ID of a Proxmox VM

For whatever reason I find that seeing gaps in IDs between VMs annoying. I don't like seeing gaps such as:

VM100 - 100
VM101 - 101
VM103 - 103
VM104 - 104

Thankfully there's a bit of a way to adjust the IDs for VMs. I would recommend taking a backup of the VM and it's configuration file(s) beforehand. Once you're ready you can run the following command to display information about your logical volumes.

lvs -a

This should display something similar to:

  LV              VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  vm-100-disk-0   data -wi-ao---- 120.00g                                                    
  vm-101-disk-0   data -wi-ao----  80.00g                                                    
  vm-101-disk-1   data -wi-ao---- 120.00g                                                    
  vm-102-disk-0   data -wi-a----- 120.00g                                                    
  vm-103-disk-0   data -wi-ao----  80.00g                                                    
  vm-104-disk-0   data -wi-ao----  80.00g                                                    
  vm-105-disk-0   data -wi-ao---- 320.00g                                                    
  vm-105-disk-1   data -wi-ao---- 120.00g                                                    
  vm-105-disk-2   data -wi-ao---- 120.00g                                                    
  vm-106-disk-0   data -wi-ao----  80.00g                                                    
  vm-107-disk-0   data -wi-ao---- 120.00g                                                    
  data            pve  twi-a-tz--  59.66g             0.00   1.59                            
  [data_tdata]    pve  Twi-ao----  59.66g                                                    
  [data_tmeta]    pve  ewi-ao----   1.00g                                                    
  [lvol0_pmspare] pve  ewi-------   1.00g                                                    
  root            pve  -wi-ao----  27.75g                                                    
  swap            pve  -wi-ao----   8.00g

Next, determine which VM you're wanting to change the ID of. In the following commands I will be changing the VM ID of 101 to 100.

MAKE SURE TO SHUTDOWN THE VM BEFORE RUNNING ANY OF THESE COMMANDS!!!

This command will update the name of the logical volume:

lvrename data/vm-101-disk-0 vm-100-disk-0

Next we want to update the ID in the VMs configuration file:

sed -i "s/101/100/g" /etc/pve/qemu-server/101.conf

After that we want to rename the VMs configuration file:

mv /etc/pve/qemu-server/101.conf /etc/pve/qemu-server/100.conf

Once those commands have been run you can start the VM up again.